Isolating IR receiver from disruption?

I'm using a simple IR receiver connected to the Arduino through A0 analog pin. The problem is that I want to stabilize the output of IR receiver when it's not receiving an IR signal from a specific IR source, or at least minimizing the disruption to a specific range that I can handle, no matter where its position, But in my case moving the IR receiver a few inches in any direction will results in different voltage output. the difference between values on disruption is very random to handle.

What can I do to isolate IR receiver, may be a specific material or a specific color?

If your IR signal is modulated, you might benefit from ac coupling the signal to the analog pin so that the normal (dc) background is rejected.

Pogo

watch at 4:55